Ariobarzanes (Greek: Ἀριoβαρζάνης; reigned 266 BC – c. 250 BC) was the second king of Pontus, succeeding his father Mithridates I Ctistes in 266 BC. He died in an uncertain date between 258 and 240 BC. He obtained possession of the city of Amastris in Paphlagonia, which was surrendered to him.^[1] Ariobarzanes and his father sought the assistance of the Gauls, who had come into Asia Minor twelve years before the death of Mithridates, to expel the Egyptians sent by Ptolemy II Philadelphus.^[2] Ariobarzanes was succeeded by Mithridates II.

• Hazel, John; Who's who in the Greek world, (1999), "Ariobarzanes"
• Memnon, History of Heracleia, Andrew Smith (translator), (2004)
• Smith, William (editor); Dictionary of Greek and Roman Biography and Mythology, "Ariobarzanes III" Archived 2005-12-31 at the Wayback Machine, Boston, (1867)
•  This article incorporates text from a publication now in the public domain: Smith, William, ed. (1870). "Ariobarzanes (1)". Dictionary of Greek and Roman Biography and Mythology. Vol. 1. p. 286.